On Tue, Feb 22, 2022 at 09:57:37PM +0300, Kirill A. Shutemov wrote:
On x86, cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT) supposes to return
true for HyperV if isolation is supported. But it only does it if the
kernel is compiled with AMD_MEM_ENCRYPT enabled.
It happens due to missed ARCH_HAS_CC_PLATFORM dependency. Without
ARCH_HAS_CC_PLATFORM enabled, cc_platform_has() always returns false.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Cc: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu@xxxxxxxxxx>
Cc: Dexuan Cui <decui@xxxxxxxxxxxxx>
Cc: Tianyu Lan <Tianyu.Lan@xxxxxxxxxxxxx>
---
drivers/hv/Kconfig | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 0747a8f1fcee..424d3f0751dc 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -8,6 +8,7 @@ config HYPERV
|| (ARM64 && !CPU_BIG_ENDIAN))
select PARAVIRT
select X86_HV_CALLBACK_VECTOR if X86
+ select ARCH_HAS_CC_PLATFORM if x86
select VMAP_PFN
help
Select this option to run Linux as a Hyper-V client operating
--
Good catch.
I'm guessing this needs
Fixes: c789b90a6904 ("x86/hyper-v: Add hyperv Isolation VM check in the cc_platform_has()")
which added hyperv_cc_platform_has() and which needs to go to Linus now,
as an urgent fix for 5.17 as that patch came into 5.17-rc1.
Wei?